how old is your tank....a new tank goes through quite a bit of change in the first year that make keeping sps very difficult. But once the tank is matured, not just established, but matured, sps can be pretty easy (generally, you may not have the best or worst, but should be able to keep them with minimal effort if your setup is sufficient).
just my 2 cents...save your money til the tank matures, if it is not. If it is....seriatopora is a fairly good beginner sps in my opinion, so are digitata and undata.